Grinding wheel guard



Dec. 20, 1932. J, TRlMBLE 1,891,696

GRINDING WHEEL GUARD Filed Sept. 50, 1951 INVENTOR FEEDJ 75/ 1.1:

Patented Dec. 20, 1932 UNITED STATES PATENT OFFICE Q i IRE!) J. TRmBLnoF1vLAYw0on, :CALIVFQRNIA GRINDING wnEnnouAn-n i p f Application filedSeptember so, IQSIQI Seri aI na seaoszl I The present invention relatesto a grinding wheel guard and has for its primary object to provide, ina manner as hereinafter set forth, a device of this Character embodyinga novel construction, combination and arrangement of parts through themedium of which flying particles which may be thrown out by centrifugalforce will be arrested, 7 thereby preventing possible injury to theperson using the wheel. 1 v

' Another important object of the invention is to provide a grindingwheel guard of the character described which is adapted to enclose amajor portion of the wheel and which includes novel means for adjustmentthrough the medium of which as much of the wheel as may be desired maybe exposed.

A further important object of the invention is to provide a grindingwheel guard of the aforementioned character which may be expeditiouslyadjusted to;fit various sizes of grinding wheels and also to accuratelylit a grinding wheel as it 'is' worn away.

Other objects of the invention are to provide a grindingfwheel guardwhich will be simplein construction, strong, durable; ellici ent andreliable in use and. which may be manufactured'at low cost.

" All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of the followingspecification, taken in connection with the accompanying drawing whereinlike characters of reference designate corresponding parts throughoutthe several views, and wherein Figure 1 is a View in front elevation ofa guard in accordance with the present invention.

Figure 2' is a view in sideelevation thereof. Figure 3 is a view invertical section taken substantially on the'line 3-3 of Figure 1.

Figure 4 is a view in vertical cross section taken substantially on theline 4-4 of Figure 2.

Referring now to the drawings in'detail, it will be seen that thereference numeral 1 designates a supporting stand upon which an electricmotor?! is secured through the medium of the bolts 3 and 4. The bolts 4are also the passage into the housing of the motor utilized to secure 'asupporting bracket '5 in position, said bracket having adownwardlyoffset outer portion and having the upper side of its free endportionconcave, as at6. l

A substantially segmental housing desig- 55 nated generally by thereference numeral 711s adjustably mounted onthe bracket 5. The

housing 7 comprises an inner wall 8 with which the peripheral wall 9 isformed intec. grally. The housing 7 further comprises an (60 outer wall10 which is removable and which is secured in position by theangle clips11 the legs of which are apertured for the passage of screws 12 whichare threaded into said outerwall 10 and the peripheral wall'9. The g5outenwall 10 of the housing 7 is formed with an outwardly pressedcentral portion 13 providing a chamber 14; The inner wall 8 is providedwith a centrally disposed opening15 for shaft 16 upon which the grindingwheel 17 is secured bysuitable means including a retaining nut 18 whichis threaded on the free end portion'of the motor shaft 16. The chamberltaccommodates said free end portion of the motor shaft 16 and the nut18.

The peripheral wall 9 of the housing 7 seats in the-concavity 6 of'thebracket 5 and has in its lower portion a circumferentially ex- Q tendingslot 19 for the passageof a clamping 3 bolt 20. The head of the bolt 20is engaged with the inner periphery of the wall 9 of the housing. Thebolt 20 passes through the slot '19 and through an openingprovidedtherei. for inthefree end portion of the bracket 5 and has threadedthereona winged nut 21. A look washer 22 is mounted on the bolt 20between the winged nut 21and the bracket As will be seen a portion ofthe wheel isexposed by the cut away portion of the substantiallysegmental housing 7. The area of the wheel which is exposed may beregulatedas desiredby loosening the clamping bolt 20 and rotating ortilting the housing 7 on the bracket 5, as indicated in broken lines inFigure3 of the-drawing.- Obviously whenthe 'ho'using 7 is shifted tobring one end of theslot' l9 closer to the bolt 20, the exposed portionof the wheel 17 will be increased-and'when the housing 7 is shifted tobring the other. end 10 ofthe slot 19 closer to the bolt 20 the area ofthe wheel 17 which is exposed will be decreased. The reference numeral23 designates a section conduit which is connected to a lower, rearportion of the housing 7 for carrying away dust and loose particles. In-

.turned flanges 24 are provided on the ends of the peripheral wall 9 ofthe housing 7.

The reference numeral 25 designates angular side guard plates which aredisposed closely adjacent the side faces of the wheel 17. The guardplates 25 are adjustably mounted on the side walls 8 and 10 of thehousing 7 in the opening of said housing through which the wheel 17projects and for adjustment toward and away from said wheel through themedium of the angular clips 26 which may be secured on the housing byscrews 27. The side guard plates 25 are provided with transverse slots'28 for thepassage of the screws 29 which are threaded into the angleclips 26. Thus, by loosening the screws 29, the guard plates 25 may beadjusted laterally toward or away from the grinding wheel 17, asindicated in broken lines in Figure 1 of the drawmg. l

The reference numeral 30 designates transversely extending upper andlower guard plates which are substantially flat and which have one edgedisposed closely adjacent the periphery of the wheel 17. The upper andlower guard plates 30 overlap the upper and lower end portions of theside guard plates 25 and have their end portions provided with thevertically extending slots 31 which communicate with the uppermost andlowermost transversely extending slots 28 of the guard plates 25. Theuppermost and lowermost of the screws 29 are utilized for adjustablysecuring the upper and lower guard plates 30 in position for adjustmenttoward or away from the periphery of the wheel 17, said screws, ofcourse, being operable in the slots 31. As best seen in Figure 3 of thedrawing, the upper and lower portions of the side guarzd plates 25 abutthe flanges 24 of the housmg 7 It is believed that the many advantagesof a guard in accordance with this invention will be readily understood,and although the preferred embodiment of the invention is as illustratedand described, it is to be understood that changes in the details ofconstruction and in the combination and arrangement of parts may beresorted to which will fall within the scope of the invention asclaimed.

What is claimed is 1. A grinding wheel guard comprising a bracket. asubstantially segmental housing mounted on the bracket, the cut-awayportion of the housing being open, the wheel being operable in thehousing and projecting through the opening, guard plates shiftablymounted on the housing for lateral adjustment toward. and away from theside faces of the wheel, and guard plates shiftably mounted on thehousing for adjustment toward and away from the periphery of the wheel.

2. A grinding wheel guard comprising a bracket having a free end portionprovided with an arcuate recess, a substantially segmental housingadjustably mounted on the bracket and seated in the recess, the cut-awayportion of the housing being open, the wheel being operable in thehousing and projecting through the opening, the peripheral portion ofthe housing which is engaged with the bracket having a circumferentiallyextending slot therein, a headed bolt engaged with the housing andextending through the slot and the bracket, and a nut threaded on thebolt for frictionally clamping the housing in adjusted position on thebracket.

3. A grinding wheel guard comprising a substantially segmental housing,a cutaway portion of said housing being open, the wheel being operablein the housing and projecting through the opening therein, substantiallyvertically disposed angular guard plates shiftably mounted on thehousing over the opening therein for lateral adjustment toward and awayfrom the side faces of the wheel, and transversely extending guardplates shiftably mounted on the end portions of the first named guardplates for ad'ustment toward and away from the perip ery of the wheel.

4. A grinding wheel guard comprising a substantially segmental housing,a cut-away portion of said housing being open, the wheel being operablein the housing and projecting through the opening therein, substantiallyvertically disposed angular guard plates shiftably mounted on thehousing over the opening therein for lateral adjustment toward and awayfrom the side faces of the wheel, and transversely extending guardplates shiftably mounted on the end portions of the first named guardplates for adjustment toward and away from the periphery of the wheel,angle clips rigidly mounted on the housing adjacent the opening therein,the first named guard plates having transversely extending slotstherein, the second named guard plates having-substantially verticallyextending slots therein, and securing elements passing through the slotsand threadedly engaged with the angle clips for securing the guardplates in adjusted position on the housing.

In testimony whereof I aflix my signature.

' FRED J. TRIMBLE.

